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Laser line width measurement system and method based on short-delay self-homodyne coherent envelope

A laser line width and measurement system technology, applied in photometry, optical radiation measurement, measurement devices, etc., can solve the problems of reducing the accuracy of coherent measurement, and achieve the effect of facilitating integration, ensuring accuracy, and improving accuracy

Pending Publication Date: 2020-06-02
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0006] Aiming at the problems in the prior art that the mutual interference between devices is large and the self-heterodyne phase method needs frequency shift, which further reduces the accuracy of coherent measurement, the present invention provides a laser linewidth based on short-delay self-homodyne coherent envelope Measurement Systems and Methods

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  • Laser line width measurement system and method based on short-delay self-homodyne coherent envelope
  • Laser line width measurement system and method based on short-delay self-homodyne coherent envelope
  • Laser line width measurement system and method based on short-delay self-homodyne coherent envelope

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with drawings and embodiments.

[0029] see figure 1 , one A laser linewidth measurement system based on short-delay self-homodyne coherent envelope, including: laser (laser), first optical attenuator (VOA1), second optical attenuator (VOA2), optical isolator (ISO), the first A coupler (C1), a delay fiber (DF), a second coupler (C2), a photodetector (PD) and a spectrum analyzer (ESA); the length of the delay fiber (DF) is the coherence of the laser (laser) The length is K times, K>1; the laser (laser), the optical isolator (ISO), and the first coupler (C1) are connected in sequence, and the first output end of the first coupler (C1) passes through the first optical attenuator (VOA1) is connected to the first input end of the second coupler (C2), the second output end of the first coupler (C1) is connected to one end of the delay fiber (DF), and the other end of the delay fiber (DF) The second optic...

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Abstract

The invention relates to a laser line width measurement method based on a short-delay self-homodyne coherent envelope. The laser line width measurement method comprises the following steps of: S1, acquiring a power spectrum output by a laser line width measurement system based on the short-delay self-homodyne coherent envelope; S2, selecting adjacent wave crests and wave troughs on the power spectrum, and calculating a difference value delta S of contrast ratios of the selected wave crests and wave troughs on the power spectrum; S3, and calculating a laser line width delta f of a laser deviceaccording to the difference delta S and the length of a delay optical fiber. According to the laser line width measurement method, the integration of a measurement system is facilitated, the precisionof the measurement system can be ensured, the self-homodyne mode does not need frequency shift, the coherence of a double-arm optical path is increased, and the precision of coherent measurement is further improved.

Description

technical field [0001] The invention relates to the technical field of laser linewidth measurement, in particular to a laser linewidth measurement system and method based on short-delay self-homodyne coherent envelope. Background technique [0002] Those skilled in the art should understand that the laser linewidth has a great influence on the accuracy, sensitivity, detection distance and detection noise of the detection system. For example: in the field of photons, the laser linewidth determines the coherence of the quantum system; In the order modulation technology and coherent detection system, the laser linewidth determines the capacity of the optical communication system; in the fiber optic hydrophone system, the laser linewidth determines the system noise and the minimum measurable signal of the system; In BOTDR, the laser line width determines the measurement resolution of temperature and stress, etc. Therefore, when building the system, it is necessary to precisely ...

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Application Information

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IPC IPC(8): G01J11/00G01J1/42G01M11/02
CPCG01J1/4257G01J11/00G01M11/02
Inventor 黄仕宏方晓惠刘翠红万明桂张武李杰文
Owner GUANGZHOU UNIVERSITY